

<script>
import {h,ref} from 'vue'
export default {
  setup(){
    const  counter = ref(0);
    return () => {
        //三个参数 1.标签名 2.
        return h("div",{class:"app "},[
          h("h2",null,'当前计数：$counter.value'),
          h("button",{
            onClick: () => counter.value++
          },"+1"),
          h("button",{
            onClick: () => counter.value--
          },"-1"),
        ]);
    }
  }

}
</script>

<style scoped>

</style>